MOGADISHU, Somalia (AP) — A Somali police official says a suicide bomber has detonated an explosives-laden car outside the United Nations Mine Action Service offices in Mogadishu, killing three other people.

Captain Mohamed Hussein said Tuesday unlike previous attacks blamed on the al-Qaida-linked militant group al-Shabab, gunmen did not accompany the suicide bomber.

No group has claimed responsibility for the attack which is in a highly guarded area because of the U.N. offices and African Union troops’ base. Suspicion has, however, fallen on al-Shabab, which is waging an insurgency against Somalia’s weak U.N.-backed government.

Al-Shabab wants to establish an Islamic emirate in the country based on a strict form of Islam.

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